He studied at Eötvös Loránd University public research university in Budapest, gaining a master's degree in 1983 with his thesis titled Atomic absorption analysis of heavy metal contents of lichens transplanted in Budapest supervised by Klára Verseghy.
For most of his career, he has been curator of the lichen collection in the Botanical Department of the Hungarian Natural History Museum, Budapest, after the retirement of Klára Verseghy.
In 1992 he accompanied Farkas on a year-long visit to the Natural History Museum, London, collaborating with David J. Galloway and others.
In 1997 he collaborated in the production of the first red list for lichens in Hungary that resulted in legal protection for 5 species in 2005 and later 12 more.
Lőkös has also undertaken substantial roles in editing Hungarian books and scientific journals.